android上用opengl画线

android上用opengl画线

/* ** ** Copyright 2006, The Android Open Source Project ** ** Licensed under the Apache License, Version 2.0 (the "License"); ** you may not use this file except in compliance with the License. ** You may obtain a copy of the License at ** ** http://www.apache.org/licenses/LICENSE-2.0 ** ** Unless required by applicable law or agreed to in writing, software ** distributed under the License is distributed on an "AS IS" BASIS, ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. ** See the License for the specific language governing permissions and ** limitations under the License. */ #include <stdlib.h> #include <stdio.h> #include <EGL/egl.h> #include <GLES/gl.h> #include <GLES/glext.h> static void gluLookAt(float eyeX, float eyeY, float eyeZ, float centerX, float centerY, float centerZ, float upX, float upY, float upZ) { // See the OpenGL GLUT documentation for gluLookAt for a description // of the algorithm. We implement it in a straightforward way: float fx = centerX - eyeX; float fy = centerY - eyeY; float fz = centerZ - eyeZ; // Normalize f float rlf = 1.0f / sqrtf(fx*fx + fy*fy + fz*fz); fx *= rlf; fy *= rlf; fz *= rlf; // Normalize up float rlup = 1.0f / sqrtf(upX*upX + upY*upY + upZ*upZ); upX *= rlup; upY *= rlup; upZ *= rlup; // compute s = f x up (x means "cross product") float sx = fy * upZ - fz * upY; float sy = fz * upX - fx * upZ; float sz = fx * upY - fy * upX; // compute u = s x f float ux = sy * fz - sz * fy; float uy = sz * fx - sx * fz; float uz = sx * fy - sy * fx; float m[16] ; m[0] = sx; m[1] = ux; m[2] = -fx; m[3] = 0.0f; m[4] = sy; m[5] = uy; m[6] = -fy; m[7] = 0.0f; m[8] = sz; m[9] = uz; m[10] = -fz; m[11] = 0.0f; m[12] = 0.0f; m[13] = 0.0f; m[14] = 0.0f; m[15] = 1.0f; glMultMatrixf(m); glTranslatef(-eyeX, -eyeY, -eyeZ); } static void checkGLErrors() { GLenum error = glGetError(); if (error != GL_NO_ERROR) fprintf(stderr, "GL Error: 0x%04x/n", (int)error); } #define PI 3.1415926535897932f static void gluPerspective(GLfloat fovy, GLfloat aspect, GLfloat zNear, GLfloat zFar) { GLfloat xmin, xmax, ymin, ymax; ymax = zNear * (GLfloat)tan(fovy * PI / 360); ymin = -ymax; xmin = ymin * aspect; xmax = ymax * aspect; glFrustumx((GLfixed)(xmin * 65536), (GLfixed)(xmax * 65536), (GLfixed)(ymin * 65536), (GLfixed)(ymax * 65536), (GLfixed)(zNear * 65536), (GLfixed)(zFar * 65536)); } void init(int width, int height) { // glEnable(GL_NORMALIZE); // glEnable(GL_DEPTH_TEST); glDisable(GL_CULL_FACE); // glShadeModel(GL_FLAT); //glEnable(GL_LIGHTING); //glEnable(GL_LIGHT0); //glEnable(GL_LIGHT1); //glEnable(GL_LIGHT2); glEnableClientState(GL_VERTEX_ARRAY); glEnableClientState(GL_COLOR_ARRAY); glOrthof(0, (float)width, 0, (float)height, 0, 100); } static void prepareFrame(int width, int height) { glViewport(0, 0, width, height); glClearColorx((GLfixed)(0.1f * 65536), (GLfixed)(0.2f * 65536), (GLfixed)(0.3f * 65536), 0x10000); glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT); glMatrixMode(GL_PROJECTION); glLoadIdentity(); // gluPerspective(45, (float)width / height, 0.5f, 150); /*glFrustumf(0.0f, 1.0f, 0.0f, 1.0f, 1.0f, 30.0f); */ glOrthof(0.0, width, 0.0, height, -1.0, 1.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } GLfloat vertices[][2] = { { 100.25f, 100.25f }, { 100.75f, 100.25f }, { 200.75f, 200.75f }, { 100.25f, 200.75f } }; GLubyte colors[][4] = { { 255, 0, 0, 80 }, { 255, 0, 0, 80 }, { 255, 0, 0, 80 }, { 255, 0, 0, 80 } }; int main(int argc, char** argv) { EGLint s_configAttribs[] = { EGL_RED_SIZE, 5, EGL_GREEN_SIZE, 6, EGL_BLUE_SIZE, 5, EGL_NONE }; EGLint numConfigs = -1; EGLint majorVersion; EGLint minorVersion; EGLConfig config; EGLContext context; EGLSurface surface; EGLint w, h; EGLDisplay dpy; dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY); eglInitialize(dpy, &majorVersion, &minorVersion); eglChooseConfig(dpy, s_configAttribs, &config, 1, &numConfigs); surface = eglCreateWindowSurface(dpy, config, android_createDisplaySurface(), NULL); context = eglCreateContext(dpy, config, NULL, NULL); eglMakeCurrent(dpy, surface, surface, context); eglQuerySurface(dpy, surface, EGL_WIDTH, &w); eglQuerySurface(dpy, surface, EGL_HEIGHT, &h); GLint dim = w<h ? w : h; printf("w=%d, h=%d/n", w, h); init(w, h); int i=0, j=0; //while(1){ prepareFrame(w, h); /*r(i=0; i<4; i++){ vertices[i][0] += 1.0f; vertices[i][1] += 1.0f; }*/ glPushMatrix(); glVertexPointer(2, GL_FLOAT, 0, vertices); glColorPointer(4, GL_UNSIGNED_BYTE, 0, colors); glDrawArrays(GL_LINES, 0, 4); glPopMatrix(); checkGLErrors(); eglSwapBuffers(dpy, surface); checkGLErrors(); //} return 0; }

放到frameworks/base/opengl/test下编译

adb push 到emulator中运行